Obsidian

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Obsidian

Obsidian was used for many kinds of cutting tools and weapon
points, and was by far the raw material of choice for making
chipped stone tools at Çatalhöyük - but ironically, obsidian
is not a type of stone at all! Obsidian is a natural
volcanic glass and is thought to have been brought to
Çatalhöyük from nearby mountain sources such as Hasan Dag.
While stone tools may seem primitive and crude to us, the
edge of an obsidian blade is actually sharper than a modern
medical scalpel. This is because unlike stone, glass is made
of pure silica instead of various mineral grains - so when
obsidian is fractured it can create an edge with a thickness
of only one molecule of silica!